Question

1.31 if 3.7 grams of a gas contains 3.7 × 1022 molecules, what is the molar mass of this gas in units of g/mol?

Answer 1

Molar mass of the gas will be 60.65 gram/mole

The given mass of gas = 3.7 gram

Gas contains = 3.7×$10^{22}$ molecules

We know that any gas contain 6.022×$10^{23}$ molecules in 1 mole

So number of moles ,

$\frac{3.78*10^{22} }{6.022*10^{23} }$

Moles= 0.061

We know that number of moles is,

$n= \frac{mass in gram}{molar mass}$

So, $0.061= \frac{3.7}{molar mass}$

Molar mass of the gas will be 60.65 gram/mole

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